Viking VDB325 VDB450 VDB325E VDB450E Dishwasher Service Manual PUB SMK-0003

Service Manual

Preferred Service

                               

Built-In Dishwasher

This Base Manual covers general and      limited to the following models: VDB325 VDB450

(From 5/26/2010)

SMK-0003 January, 2011

Table of Contents Description

Page

Important Information ....................................................... 3 Safety Information .............................................................3

WARRANTY INFORMATION Warranty Information.........................................................4 Warranty Service Information ............................................ 5

GENERAL INFORMATION Specifications .................................................................... 6 Dimensions ........................................................................6 Warnings............................................................................ 8 Model–Serial Number Matrix ..........................................10

OPERATION Settings and Functions-325 Model .................................11 Pots/Pans ....................................................................... 11 Normal Wash................................................................. 11 Light/China ....................................................................11 Rinse/Hold .....................................................................11 Options............................................................................ 11 155˚F (68˚C) Final Rinse .................................................11 Delay Start .....................................................................11 Settings and Functions-450 Model .................................12 Wash Cycles .................................................................. 12 Pots/Pans ....................................................................... 12 Normal Wash................................................................. 12 Econo Wash................................................................... 12 Light/China ....................................................................12 Rinse/Hold .....................................................................12 Options............................................................................ 12 Top Wash Only ..............................................................12 Econo Dry ...................................................................... 12 155˚F (68˚C) Final Rinse .................................................12 Hi Temp Wash ...............................................................12 Delay Start .....................................................................12 Preparing Dishes .............................................................13 Before Operation ............................................................13 Option Restrictions..........................................................13 Changing a Program After the Unit Has Started ............. 13 Opening the Door After Cycle Has Started..................... 13

DIAGNOSTICS Entering Diagnostic Mode–325 Model ........................... 14 Entering Diagnostic Mode–450 Model ........................... 15 Fail Codes........................................................................18 Parts Location–Control Board..........................................19 Control Board Test Points ................................................ 20 Control Board Diagnostics ..............................................21 Door Switch ...................................................................21 Detergent Dispenser ..................................................... 21 Door Vent–450 Model ................................................... 22 Circulation Motor...........................................................22 Fill Valve ........................................................................23 Drain Motor ................................................................... 23 Moisture Sensor.............................................................23 Wash Diverter ................................................................24 Moisture Sensor.............................................................24 Water Temperature Sensor ............................................24 Water Pressure Sensor ...................................................25 User Interface Port......................................................... 25 Water heater .................................................................. 25

© 2011 Viking Preferred Service

Description

Page

SERVICE DIAGNOSTICS AND PROCEDURES Dryer Motor–450 Model................................................26 Dryer Heater–450 Model............................................... 26 Parts Location–Door 325 Model......................................27 Parts Location–Door 450 Model......................................28 Door Disassembly............................................................ 29 Outer Door Removal (325 and 450) .............................. 29 Control Panel Removal ..................................................30 Inner Door Components–325 Model ............................ 30 Center Door Panel Removal–450 model....................... 31 Inner Door Components–450 Model ............................32 Detergent Dispenser ..................................................... 32 Door Latch Interlock ...................................................... 33 Inner Door Duct Assembly ............................................33 Drying Vent Assembly–450 Model ................................34 Door Vent Mechanism–450 Model ................................ 34 Power ON Light.............................................................35 Door Spring and Cable Assembly ................................. 36 Door Hinge Disassembly............................................... 37 Parts Location–Interior.....................................................38 Lower Spray Arm Removal ............................................39 Coarse Strainer Removal ...............................................39 Fine Strainer Removal ....................................................39 Base Pan–Front View .......................................................40 Base Cover Disassembly ................................................. 40 Parts Location–Base Unit–325 Model..............................41 Parts Location–Base Unit–450 Model..............................42 Drain Motor Disassembly ................................................ 43 Wash Diverter Disassembly ............................................. 43 Circulation Motor Disassembly........................................44 Water Heater Disassembly .............................................. 45 Water Temperature Sensor Disassembly ......................... 46 Fill Valve Disassembly......................................................46 Control Board Disassembly ............................................. 47 Motor Controller Board Disassembly ..............................48 Dryer Motor and Heater Assembly–450 Model ..............49 Dryer Motor–450 Model .................................................. 51 Water Level Sensor ..........................................................52 Drying System ................................................................. 53 Troubleshooting Guide....................................................54

WIRING DIAGRAMS Wiring Diagram–325 Model ............................................ 55 Wiring Diagram–450 Model ............................................ 56 Motor Controller Board Wiring Connections .................. 57 Control Board Wiring Connections ................................. 58 Component Information–Electrical Specifications .......... 59

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Important Information

SAVE THESE INSTRUCTIONS REVIEW ALL SERVICE INFORMATION IN THE APPROPRIATE SERVICE MANUAL AND TECHNICAL SHEETS BEFORE BEGINNING REPAIRS. Pride and workmanship go into every product to provide our customers with quality appliances. It is possible, however, that during the lifetime of a product, service may be required. Products should be serviced only by a qualified authorized service technician who is familiar with the safety procedures required to perform the repair and is equipped with the proper tools, parts, testing instruments, and the appropriate service manual.

Safety Information We have provided manyand important safety messages throughout this manual on the appliance. ALWAYS read and obey all safety messages. This is a safety alert symbol.

All messages willchance identifyofthe hazard, yousafety how to reduce the injury, and tell inform you what can happen if the instructions are not followed.

WARNING This symbol alerts personnel to hazards that can kill or hurt you and others. All safety messages will be preceded by a safety alert symbol and the word “DANGER”, “WARNING” or “CAUTION”. These words mean:

DANGER Immediate hazards which WILL result in severe personal injury or death.

WARNING Hazards or unsafe practices which COULD result in severe personal injury or death.

CAUTION Hazards or unsafe practices which COULD result in minor personal injury, product or property damage.


To avoid risk of serious injury or death, repairs should not be attempted by unauthorized personnel.

CAUTION VIKING will not be responsible for any injury or property damage from improper service procedures. If performing service on your own product, you must assume responsibility for any personal injury or property damage which may result. To locate an authorized service agent, call: Viking Customer Service Phone No. 1-888-845-4641 Address your written correspondence to: Viking Preferred Service 1803 HWY 82 West Greenwood, MS 38930

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Warranty Information Professional Series Built-In Dishwasher Warranty One Year Full Warranty

Undercounter dishwashers and all of their component parts, except as detailed below*, are warranted to be free from defective materials or workmanship in normal household use for a period of twelve (12) months from the date of srcinal retail purchase. Viking Range Corporation, warrantor, agrees to repair or replace, at its option, any part which fails or is found to be defective during the warranty period. *Painted and decorative items are warranted to be free from defective materials or workmanship for a period of ninety (90) days from the date of srcinal retail purchase. ANY DEFECTS MUST BE REPORTED TO THE SELLING DEALER WITHIN NINETY (90) DAYS FROM DATE OF ORIGINAL RETAIL PURCHASE.

Five Year Limited Warranty Any upper and/or lower nylon rack which rusts due to defective materials or workmanship and any electronic controls which fail due to defective materials or workmanship in normal household use during the second through fifth year from the date of srcinal retail purchase will be repaired or replaced, free of charge for the part itself, with the owner paying all other costs, including labor. Any motor/pump assembly or water distribution system component as listed below which fails due to defective materials or workmanship in normal household use during the second through fifth year from the date of srcinal retail purchase will be repaired or replaced, free of charge for the part itself, with the owner paying all other costs, including labor.

Motor/Pump and Water Distribution System Components Circulation motor/pump; Lower wash arm; Drain motor/pump; Tube to upper wash arm; Fill valve; Upper wash arm

Lifetime Limited Warranty

Any stainless steel tank or inner door liner which develops a water leak due to defective materials or workmanship in normal household use during the lifetime of the product will be repaired or replaced, free of charge for the part itself, with the owner paying all other costs, including labor.

Ninety (90) Day Residential P lus Warranty This warranty applies to applications where use of the product extends beyond normal residential use. Examples are, but not limited to, bed and breakfasts, fire stations, private clubs, churches, etc. This warranty excludes all commercial locations such as restaurants, food service locations and institutional food service locations. This warranty extends to the srcinal purchaser of the product warranted hereunder and to each transferee owner of the product during the term of the warranty. This warranty shall apply to products purchased and located in the United States and Canada. Products must be purchased in the country where service is requested. Warranty labor shall be performed by an authorized Viking Range Corporation service agency or representative. Warranty shall not apply to damage resulting from abuse, accident, natural disaster, loss of electrical power to the product for any reason, alteration, improper installation, improper operation or repair or service to the product by anyone other than an authorized Viking Range Corporation service agency or representative. Warranty shall not apply to damage resulting from indoor units being used in outdoor situations. This warranty does not apply to commercial usage. This warranty does not cover any food or medicine loss due to product failure. Warrantor is not responsible for consequential or incidental damage whether arising out of breach of warranty, breach of contract, or otherwise. Some jurisdictions do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation or exclusion may not apply to you. Owner shall be responsible for proper installation, providing normal care and maintenance, providing proof of purchase upon request, and making the appliance reasonably accessible for service. If the product or one of its component parts contains a defect or malfunction during the warranty period, after a reasonable number of attempts by the warrantor to remedy the defects or malfunctions, the owner is entitled to either a refund or replacement of the product or its component part or parts. Replacement of a component part includes its free installation. Warrantor’s liability on any claim of any kind, with respect to the goods or services covered hereunder, shall in no case exceed the price of the goods or service or part there of which gives rise to the claim.

VIKING RANGE CORPORATION 111 Front Street, Greenwood, Mississippi (MS) 38930 USA 662-455-1200 For more product information, call 1-888-VIKING1 (845-4641), or visit our web site at http://www.vikingrange.com © 2011 Viking Preferred Service

4

Warranty Information WARRANTY SERVICE Under the terms of this warranty, service must be performed by a factory authorized Viking Range Corporation service agent or representative. Service will be provided during normal business hours, and labor performed at overtime or premium rates shall not be covered by this warranty. To obtain warranty service, contact the dealer from whom the product was purchased, an authorized Viking Range Corporation service agent, or Viking Range Corporation. Provide model and serial number and date of srcinal purchase. For the name of your nearest authorized Viking Range Corporation service agency, call the dealer from whom the product was purchased or Viking Range Corporation. IMPORTANT:Retain proof of srcinal purchase to establish warranty period. The return of the Owner Registration Card is not a condition of warranty coverage. You should, however, return the Owner Registration Card so that Viking Range Corporation can contact you should any question of safety arise which could affect you. Any implied warranties of merchantability and fitness applicable to the described halogen elements are limited in duration to the period of coverage of the applicable express written limited warranties set forth above. Some jurisdictions do not allow limitations on how long an implied warranty lasts, so the above limitation may not apply to you. This warranty gives you specific legal rights, and you may also have other rights which may vary from jurisdiction to jurisdiction. VIKING RANGE CORPORATION         (662) 455-1200 www.vikingrange.com Specification subject to change without notice.


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General Information Specifications* Built-In Dishwasher Description

VDB325

Overall width

23-7/8” (60.6 cm)

Overall height

33-7/8” (86.0 cm) min. to 35” (89.0 cm) max.

Overall depth from rear

To edge of side—24” (61.0 cm)—includes door panel With door open—49” (124.5 cm)

Cutout width

24” (61.0 cm)

Cutout height

34” (86.4 cm) min. to 35” (89.0 cm) max.

Cutout depth Electrical requirements

24” (61.0 cm) 15.0 amps, 120 VAC/60 Hz; 3’9” (1.1 m) electrical cord 3-prong plug supplied with unit

Water-heating element rating

1400 watts

Inlet water temperature

120°F (49°C) recommended; Dishwasher will perform properly with cold water Note:

Inlet water pressure operating range

Cycle times will vary

10 to 125 psi (0.69 to 8.62 bar)

Inlet water hose

5’ (1.5 m) braided stainless steel water line with 3/8” (0.95 cm) compression fitting connected to dishwasher

Drain hose

7’ (2.13 m) 1/2” (1.3 cm) ID “crimp-proof” flexible drain hose attached to dishwasher, connections provided for 5/8” (1.6 cm), 3/4” (1.9 cm) or 1” (2.5 cm), cut as required Height from floor—20” (51.0 cm) min

Drain hose high loop required Approximate shipping weight

152 lbs. (68.9 kg)

*Go to vikingrange.com for the latest specifications.

Dimensions 8” -3/ ) 26.0 cm 7 6 (

23-3/4” (60.32 cm)

23 (60-7/8 .6 c ” m)

(8633-7 .0 /8” cm to ) min . (8 9 3 5 .0 c ” m) ma x.

28-3/4” (73.0 cm)

” 24 cm) .0 (61


49” (124.5 cm)

6

General Information Specifications* Built-In Dishwasher Description

VDB450

Overall width

23-7/8” (60.6 cm)

Overall height

33-7/8” (86.0 cm) min. to 35” (89.0 cm) max.

Overall depth from rear

To edge of side—23-3/4” (60.3 cm)—includes door panel With door open—49” (124.5 cm)

Cutout width

24” (61.0 cm)

Cutout height

34” (86.4 cm) min. to 35” (89.0 cm) max.

Cutout depth Electrical requirements

24” (61.0 cm) 15.0 amps, 120VAC/60 Hz; 3’9” (1.1 m) electrical cord 3-prong plug supplied with unit.

Water-heating element rating

1200 watts

Inlet water temperature

120°F (49°C) recommended; Dishwasher will perform properly with cold water Note:

Inlet water pressure operating range

Cycle times will vary

10 to 125 psi (0.69 to 8.62 bar)

Inlet water hose

5’ (1.5 m) braided stainless steel water line with 3/8” (0.95 cm) compression fitting connected to dishwasher

Drain hose

7’ (2.13 m) 1/2” (1.3 cm) ID “crimp-proof” flexible drain hose attached to dishwasher, connections provided for 5/8” (1.6 cm), 3/4” (1.9 cm) or 1” (2.5 cm), cut as required Height from floor—20” (51.0 cm) min.

Drain hose high loop required Approximate shipping weight

157 lbs. (71.2 kg)

*Go to vikingrange.com for the latest specifications.

Dimensions 8” -3/ ) 26.0 cm (6 7

23-3/4” (60.32 cm)

23 (60-7/8 .6 c ” m)

(8633-7 .0 /8 cm ” to ) min . (8 9 3 5 .0 ” cm )m ax.

28-3/4” (73.0 cm)

24”cm) .0 (61


49”

(124.5 cm)

7

General Information Warnings Read and follow all instructions before using this appliance to prevent the potential risk of fire, electric shock, personal injury, or damage to the appliance as a result of improper usage of the appliance. Use appliance only for its intended purpose as described in this manual.

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          a food waste disposer, be sure to remove the knockout or plug from the fitting before connecting drain line.         (22.9 cm) from the floor. If connection is lower, siphoning during cycle can occur.

To ensure proper and safe operation: Appliance must be properly installed and grounded by a qualified technician. attempt to adjust, DO NOT repair, service, or replace any part of your appliance unless it is specifically recommended in this manual. All other servicing should be referred to a qualified servicer.

Water Supply

WARNING Plumbing connections must comply with applicable sanitary, safety, and plumbing codes. 

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        a minimum of 10 to 125 psi. The dishwasher is supplied with a 5’ (1.5 m) braided stainless steel water line with 3/8” (0.95 cm) compression fitting connected to dishwasher.        will connect to the dishwasher, provide a 2” (5.1 cm) access hole and run the water supply line to the approximate fill valve location.        supplied) should be installed in the supply line in a readily accessible location (such as beneath the sink).        connected to a hot water supply. If a cold water supply is used, cycle times will vary.          the shut-off valve have a sufficient flow volume. Flush the supply line prior to connecting it to the intake line of the dishwasher.

Drain          

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WARNING The dishwasher has a factory installed backflow preventer. DO NOT add an additional check valve.

Electrical Connections This appliance must be grounded. In the event of a malfunction or breakdown, grounding will reduce the risk of electric shock by providing a path of least resistance for electric current. Note: For

this model, a power cord will have to be purchased separately. The plug must be plugged into an appropriate outlet that is installed and grounded in accordance with all local codes and ordinances.

WARNING Be sure electrical power is turned off at circuit breaker or fuse box before servicing unit. DO NOT use an extension cord for this appliance.

WARNING Improper connection of the equipment – grounding conductor can result in a risk of electric shock. Check with a qualified electrician or serviceman if you are in doubt as to whether the appliance is properly grounded. DO NOT modify the plug if it will not fit the outlet, have a proper outlet installed by a qualified electrician.

2” (5.1ascm). Locate as low and as near to thesquare back wall possible. DO NOT use any fittings anywhere in the drain line that are less than 1/2” (1.3 cm) ID.


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General Information Warnings WARNING ELECTRICAL SHOCK HAZARD Electrically ground dishwasher. Connect ground wire to green ground connector in terminal box.

DO NOT use an extension cord. Failure to follow these instructions, can result in death, fire or electrical shock.

WARNING EXCESSIVE WEIGHT HAZARD Use two or more people to move dishwasher. Failure to do so can result in back or other injury.

WARNING TIP OVER HAZARD DO NOT push down on open door. Doing so can result in serious injury or cuts.


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General Information Model–Serial Number Matrix The serial number and model number for your appliance are located on the identification plate mounted on the inside of the unit.

Model Numbers

V D B 3 2 5 S S

V=Viking Professional Series D=Dishwasher B=Built-In

SS=Stainless Version

Serial Numbers 09 22 10 D00019027 Month Day Year of Manufacture

Serial Number

A S HOUSEHOLD DISHWASHER MODEL VDB325SS U CSA e 120V 60Hz OPER 12.2A VIKING RANGE ® th E 2.5A CORPORATION in e OTHER 15.5A GREENWOOD, MISSISSIPPI d LISTED a SERIAL NO 092210D00019027 38930 USA 3HV V M


C

UL

US

01 3597 000

10

Operation Settings and Functions–325 Model Control Operation The following is the basic layout of the control panel and how it is referenced below.

 

Vari-Pressure Intelli-Wash Quiet Clean System

POTS PANS

Start Key

NORMAL WASH

SECOND WASH

LIGHT CHINA

Cycles

RINSE HOLD

HI TEMP WASH

155˚ FINAL RINSE

DELAY START

Options

Wash Cycles

Options

Pots/Pans Heavily soiled pots, pans and casserole dishes. Long heated pre-wash loosens up encrusted food. High temperature main wash and final rinse.

155°F (68°C) Final Rinse Increases the temperature of final rinse to 155°F (68°C). Available on Pots/Pans and Normal Wash cycle.

Normal Wash Normally soiled plates, glasses, bowls, and lightly soiled pots and pans. Normal pre-wash, main wash and rinse. Medium pressure and temperature.

Delay Start Lets you delay running the dishwasher for up to 10 hours. To set DELAY START, select the desired wash cycle and option(s). Press the “DELAY START” button once and the number “2” will light, indicating a two-hour delay. If you desire a longer delay, continue pressing the “DELAY START” button to a four, six, eight or ten hour delay. The corresponding number on the button will light. Once you have set the desired delay time, press the “START” button and close the door. DELAY START is not available with the Rinse/Hold cycle.

Econo Wash Normally soiled plates, glasses, bowls, and lightly soiled pots and pans. Lower temperature main wash and rinse. Longer pre-wash and main wash to maximize cleaning performance while using less energy. Light/China Lightly soiled dishes or fine china and crystal. Low temperature wash and rinse. Lightest pressure to protect dishes. Rinse/Hold All dishware. Short, medium pressure rinse with no heat.


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Operation Settings and Functions–450 Model Control Operation The following is the basic layout of the control panel and how it is referenced below.

  

Vari-Pressure Intelli-Wash Quiet Clean System Airflow Gentle Dry

POTS PANS

Start Key

NORMAL WASH

SECOND WASH

LIGHT CHINA

RINSE HOLD

Cycles

TOP WASH

ECONO DRY

155˚ FINAL RINSE

DELAY START

Options

Wash Cycles

Options

Pots/Pans Heavily soiled pots, pans and casserole dishes. Long heated pre-wash loosens up encrusted food. High temperature main wash and final rinse.

Top Wash Only Washes dishes on top rack only. Uses less water. Conserves energy. Available on Normal Wash cycle.

Normal Wash Normally soiled plates, glasses, bowls, and lightly soiled pots and pans. Normal pre-wash, main wash and rinse. Medium pressure and temperature. Econo Wash Normally soiled plates, glasses, bowls, and lightly soiled pots and pans. Lower temperature main wash and rinse. Longer pre-wash and main wash to maximize cleaning performance while using less energy. Light/China Lightly soiled dishes or fine china and crystal. Low temperature wash and rinse. Lightest pressure to protect dishes. Rinse/Hold All dishware. Short, medium pressure rinse with no heat.

Econo Dry Selects a “no heat” dry. Available on Normal Wash, Econo Wash and Light China cycles. 155° F (68° C) Final Rinse Increases the temperature of final rinse to 155° F (68°C). Available on Pots/Pans and Normal Wash cycle. Delay Start Lets you delay running the dishwasher for up to 10 hours. To set DELAY START, select the desired wash cycle and option(s). Press the “DELAY START” button once and the number “2” will light, indicating a two-hour delay. If you desire a longer delay, continue pressing the “DELAY START” button to a four, six, eight or ten hour delay. The corresponding number on the button will light. Once you have set the desired delay time, press the “START” button and close the door. DELAY START is not available with the Rinse/Hold cycle. Turning Audible Sound On and Off To turn off, press Rinse/Hold button for 10 seconds. The beep stops and the Rinse/Hold LED will flash two times. To turn on, repeat above instructions. The audible sound beeps two times and the Rinse/ Hold LED flashes two times to identify that it is on. Note:

The audible sound cannot be disabled for

error messages. The LED will flash in sync with the audible sound. Note:


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Operation Settings and Functions Preparing Dishes It is not necessary to rinse normal food soils off the dishes before putting them in the dishwasher, although larger solid particles, such as bones, seeds, skins, pits, and toothpicks should be removed. If you are not going to run the dishwasher immediately after loading, it is best to rinse salty and acidic foods off stainless contact steel, silver, and highly silverplate flatware. Prolonged of foods—including lemon juice, salt, vinegar, mustard, mayonnaise, and salad dressings—with stainless steel can cause corrosion (pitting).

Before Operation 1. Load the dishes per recommended loading. 2. Make sure there is rinse agent in the dispenser. Add rinse agent if needed. 3. Add proper amount of detergent and pre-wash. 4. Select the desired cycle and option(s).

Changing a Program After the Unit Has Started The dishwasher is programmed to stop operating if the door is opened during a cycle. To change a program or option after starting the machine, open the door slightly to let the spray arms stop rotating and avoid getting sprayed with water. Press and hold “START” for four seconds to cancel the current selection, then press the touchpad(s) for your desired selection. Press “START” again and close the door. The drain pump will run to remove any dirty water from the dishwasher before starting the newly selected cycle. Check to make sure there is still detergent in the detergent dispenser.

Opening the Door After Cycle Has Started If the door is opened after the cycle has started, the START button will flash to indicate that the dishwasher is in Standby mode. Press the “START” button and close the door securely within four seconds to restart the cycle. If a cycle is canceled, the dishwasher will drain any remaining water in the unit out.

5. Push both top and bottom racks in. 6. Press “START”. The START symbol will illuminate to indicate the unit is ready. 7. Close the door tightly until you hear a click, otherwise the dishwasher will not start.

Option Restrictions All options are not available for all cycles. Please note the following:        Final Rinse is not available in the ECONO WASH/ECONO CHINA.         cycle. After selecting the wash cycle and options, depress “START” button. The START symbol will illuminate. This merely means the machine is ready. Close door securely within four seconds of pressing the START button.


13

Service Diagnostics and Procedures Entering Diagnostic Mode–325 Model To enter the Diagnostic mode on model 325, press the left most program button five times (Pots Pans) and then immediately press the “start” button.

 


2

POTS PANS

NORMAL WASH

SECOND WASH

LIGHT CHINA

RINSE HOLD

HI TEMP WASH

155˚ FINAL RINSE

DELAY START

1

The test cycle will run approximately 6-1/2 minutes and will run each component individually. Be sure to close the soap dispenser cup as this function will also be energized opening up the cup. 1. Drains any water in the sump (pressure sensor controlled). 2. Fills until pressure sensor is satisfied (about 1 minute). 3. Soap dispenser activates. 4. Wash arm diverter sets to upper wash arm. 5. Motor circulates at 2500 RPM’s (upper wash arm) with water heater for 10 seconds. 6. Wash arm diverter sets to lower wash arm. 7. Motor circulates at 3100 RPM’s (lower wash arm) with water heater for 10 seconds. 8. Water drains below primary filter level (pressure sensor controlled). 9. Wash arm diverter sets to Filter Clean. Circulate (filter clean) for 10 seconds. 10. Drains all water in the sump (pressure sensor controlled) until empty. 11. 10 second pause–when cycle is complete, you will hear two long beeps. This is the indication that the test cycle has finished.

During this test cycle, if the Control board senses a failure that it is programmed to monitor, it will display an error code. Note:


14

Service Diagnostics and Procedures Entering Diagnostic Mode–450 Model To enter the Diagnostic mode on model 450, press the left most program button five times (Pots Pans) and then immediately press the “start” button.

  


2

POTS PANS

NORMAL WASH

SECOND WASH

LIGHT CHINA

RINSE HOLD

TOP WASH

ECONO DRY

155˚ FINAL RINSE

DELAY START

1

The test cycle will run approximately 6-1/2 minutes and will run each component individually. Be sure to close the soap dispenser cup as this function will also be energized opening up the cup. 1. Drains any water in the sump (pressure sensor controlled). 2. Fills until pressure sensor is satisfied (about 1 minute). 3. Soap dispenser activates. 4. Wash arm diverter sets to upper wash arm. 5. Motor circulates at 2500 RPM’s (upper wash arm) with water heater for 10 seconds. 6. Wash arm diverter sets to lower wash arm. 7. Motor circulates at 3100 RPM’s (lower wash arm) with water heater for 10 seconds. 8. Water drains below primary filter level (pressure sensor controlled). 9. Wash arm diverter sets to Filter Clean. Circulate (filter clean) for 10 seconds. 10. Drains all water in the sump (pressure sensor controlled) until empty. 11. 10 second pause 12. Dryer blower motor and heater will activate for 10 seconds to check amps. When cycle is complete, you will hear 2 long Beeps. This is the indication that the test cycle has finished.

During this test cycle, if the Control board senses a failure that it is programmed to monitor, it will display an error code. Note:


15

Service Diagnostics and Procedures Fail Codes LED 1 Pots & Pans

1

LED 2 Normal Wash 1

Service Cycle Only

Error Code Moisture sensor disconnect

Cause

Action

Moisture sensor reads out of normal range

1. Wires disconnected to moisture sensor in base pan

Note

2. Defective moisture sensor 3. Defective control board 1

1

2

3

Motor control status error

Motor control comms error

Motor control communicates a motor operation failure mode that is most likely caused by the motor control

1. Wires disconnected between motor control and motor

Main control cannot succesfully communicate with the motor control

1. Wires disconnected between motor controller and control board

2. Defective motor 3. Defective motor control

2. Defective Motor control 3. Defective control board

1

4

Diverter timeout

Main control activates the diverter,but never sees feedback from the diverter that the correct position is eached

1. Wires disconnected between control board and diverter 2. Defective diverter 3. Defective control board

1

5

Drainerror

Duringadrain,thepressure sensor output never drops to the“empty” level

1. Verify that dishwasher drain hose is not clogged or kinked 2. Verify that plug has been removed from disposal (if so connected) 3. Verify that hose has a high loop per installation guide 4. Verify that dishwasher is level front to back and side to side

2

1

Pressure Sensor Disconnect Error

Pressure sensor reads out of normal range low

1. Verify the pressure sensor is properly connected 2. Defective pressure sensor 3. Defective sensor harness

2

2

FillError

Duringafill,thepressuresensor output does not reach target fill pressure

1. Verify water is turned on to dishwasher 2. Verify that fill line is not kinked 3. Verify that dishwasher is level front to back and side to side 4. Verfiy there has not been a decrease in water pressure 5. Defective pressure sensor 6. Defective control

2

3

LowLevelError

Pressuresensorindicatesawater level lower than the low level thresMotor Undervoltage Error

1. Low water level in sump (check that items are secured in rack) 2. Verify that the drain has the proper high loop 3. Defective pressure sensor 4. Defective main control

2

4

HighLevelError

Pressuresensorindicatesa waterlevel higher than the high level threshold

1. Excess water in sump (check that items are secured in rack) 2. Defective pressure sensor 3. Defective main control


16

Service Diagnostics and Procedures Fail Codes (cont.) LED 1 Pots & Pans

LED 2 Normal Wash

2

5

Service Cycle Only

Error Code

Cause

Action

Level Sensor Error

Sensor level changes abnormally (drains too fast/ fills to fast)

1. Make sure that unit is l evel front to back and side to side

Note

2. Verify that the drain line has the proper high loop 3. Defective pressure sensor 4. Defective main control 3

1

User Interface– Main Control Communication Error

User interface is unable to successfully communicate with the main control

1. Wires disconnected between main control and user interface 2. Defective cable between main control and user interface 3. Defective main control 4. Defective user interface

3

2

Yes

Pump Flow Error

Control detects insufficient/ inconsistent water flow through the wash system and will not allow the flow through heater to activate

1. Verify water is fully turned on to dishwasher 2. Verify that fill line is not kinked 3. Verify that dishwasher is level front to back and side to side 4. Verify that filters are not clogged 5. Verify that there has not been a decrease in water pressure

3

3

Drain Pump Error

Drain pump current sense is out of range

1. Wires disconnected between main control and drain pump 2. Defective drain pump 3. Defective main control

3

4

Motor Status Error

Motor control communicates a motor operation failure mode that is most likely caused by the motor

3

5

Motor Undervoltage Error

Motor control communicates a low motor control voltage condition

1. Verify connection between motor controller and motor 2. Defective motor control 3. Defective machine control 1. Verify supply voltage is in speci fication 2. Verify connection at terminal block 3. Verify AC connection to the machine control 4. Verify connection between machine control and motor control 5. Defective machine control 6. Defective motor control

4

1

Temperature Sensor Error

Temperature sensor reads out of range

1. Wires disconnected to temperature sensor 2. Defective temperature sensor 3. Defective control board

4

2

Yes

Wash Heater Error

Wash heater current sense is out of range

1. Wires disconnected between main control and wash heater

450 only

2. Defective wash heater 3. Defective main control 4. Defective temperature sensor


17

Service Diagnostics and Procedures Fail Codes (cont.) LED 1 Pots & Pans

LED 2 Normal Wash

Service Cycle Only

Error Code

4

3

Yes

DispenserError

Cause

Action

Dispensercurrentsenseisoutof range

1. Wires disconnected between main control and dispenser

Note

2. Defective dispenser 3. Defective main control 4

4

Yes

InletValveError

Inletvalvecurrentsenseis outof range

1. Wires disconnected between main control and inlet valve 2. Defective inlet valve 3. Defective main control

4

5

5

1

Vent Error

Ventcurrentsenseisoutofrange

1. Wiresdisconnected betweenmain control and vent

450 only

2. Defective vent 3. Defective main control 5

2

Yes

BlowerError

Blowercurrentsenseisoutof range

1. Wires disconnected between main control and blower

450 only

2. Defective blower 3. Defective main control 5

3

Yes

Dry Heater Error

Dry heater current sense is out of range

1. Wires disconnected between main control and dry heater

450 only

2. Defective dry heater 3. Defective main control 5

4

5

5

Yes

CurrentSense Error InternalError

Main control reads current draw when no loads are active MaincontrolorUIdetectsa board level failure

1. Defective main control 2. Defective wire harness 1. Defective main control 2. Defective user interface

Flash both LED1 and LED2 continuously

Moisture Sensor–water detection

Moisture sensor output is equivalent to water in the pan

1. Water in base pan from overflow/leak

Flash all LEDs but start and run continuously

AC Power Loss

Power loss occurred during a running cycle

1. Power lost during a cycle


2. Defective moisture sensor

2. Reset by pressing and holding start for 3 seconds

18

Service Diagnostics and Procedures Parts Location–Control Board

(P8) Moisture Sensor, (P9) Temperature Sensor, User Interface Pressure Sensor Port

(P7) Drying Motor–450 Model


(P2) Door(P4) Switch, Motor Detergent Dispenser, Controller Vent Door–450 Model Board

(P12) Water Heater

(P6) Water Valve, Drain Pump, Diverter Drying Heater–450 Model

(P5) Wash Motor

(P10) Water Valve, Drain Pump

19

Service Diagnostics and Procedures Control Board Test Points The unit has a control board that controls the functions of the dishwasher. Components can be diagnosed via the control board. With the control board accessed ( see Control Board Disassembly procedure, page 43) , the following can be measured:

Component DoorSwitch StartSwitch Start Switch Dispenser

ControlBoardTestPoint

Readings(Typical)

P4-1(Red/White)–P4-2(Yellow)

0  door closed   door open

Red–Black Red White – P4-1(Red/White)–P4-4(Orange)

Lightilluminatesblue 

0

switch pressed

  switch not pressed

14.8



Three-Phase Wash Motor

Motor Controller Board

15  between Red and White, Red and Blue and Blue and White.

WaterValve

P6-3(Blue)–P10-1(White)

1.1K



DrainPump

P6-4(Brown)–P10-1(White)

30.6



Diverter(Motor)

P6-2(Gray)–P10-1(White)

Diverter(Switch)

P6-5(Yellow)–P10-1(White)

Moisture Sensor

P8-1(Red/White)–P8-2(Purple)

Temperature Sensor

P8-3 (Black/White) – P8-4 (Blue)

PressureSensor

P8-6(Brown)–P8-3(Black/White)

WaterHeater

P12(Gray)–P10-1(White)

2.7K



Switchclosed–0 Switch open – 



175K  47K        5voltsDCinput 0.5–3.5 volts DC output 12.00   

Drying Motor (450 only) Drying Heater (450 only) Vent Door (450 only) PowerOnLight


P7 Red – P7 (Blue) P6-1 (Orange) – P10-1 (White)

 

P4-1 (Red/White) – P4-3 (Brown) P8-5(Green)–P8-7(Brown)

 

5VDC

20

Service Diagnostics and Procedures Control Board DiagnosisThe diagnostic program on the 325 and 450 (when activated) will run all the components and compare the test results to the stored readings in memory. If the results are incorrect, an error code will be displayed. Suggest running the diagnostics program on pages 14-15 before removing unit for testing. (Some measurements require power and others require the unit not to be powered.) With the unit removed from the cabinet and lying on its side, remove the bottom base pan to gain access to the machine controller. (see page 47 for removal of board).

Door Switch The door interlock switch controls 12 VDC the control board. When the door is open, the to contact opens and the board stops the operation. To check the switch, unplug the molex connector and check for continuity between P4-1 (red/white) and P4-2 (yellow). With the door closed, the reading should be 0  ohms. Open the door and the reading should be infinity (). If the readings are incorrect, check the wiring to the door switch and inspect the door switch.

Detergent Dispenser The dishwasher uses a detergent dispenser to release detergent into the tub. As voltage is applied, the latch mechanism releases the dispenser door allowing detergent to enter the tub. Voltage between P4-1 and P4-2 should be 12 VDC when the dispenser is activated. If no voltage is measured, verify wiring.

Detergent Dispenser

Door Switch

P-4

Main Control Board

Testing the soap cup can be achieved in the diagnostic mode. Note:

P-4

Main Control Board


.

21

Service Diagnostics and Procedures Control Board Diagnosis (continued) (Some measurements require power and others require the unit not to be powered.) Door Vent (450 model only) At rest, the internal vent door is in the open position. When a wash cycle is activated, 12 Volts are sent to the wax motor. As the wax begins to heat, this causes the internal lever to move, closing off the vent door. This way, no steam is allowed to escape drying the wash cycle.

P-2

During dry cycle, the itvoltage removed the waxthe motor, allowing to cool.isAs it cools,from the internal lever retracts and allows the door to open. Steam can now travel into the door channel to begin condensing inside the channel.

P-5

Door Vent

Main Control Board

P-4

Main Control Board

Circulation Motor The 325 and 450 series dishwasher utilizes a three-phase AC induction motor with variable speed capabilities. The motor is controlled by the motor controller. P5-1 and P5-2 sends 120 Volts to the motor controller. The motor controller then coverts the voltage to operate the three-phase motor.

To P-2 To P-5

Circulation Motor


Testing the circulation motor can be achieved in the diagnostic mode. Note:


22

Service Diagnostics and Procedures Control Board Diagnosis (continued) (Some measurements require power and others require the unit not to be powered.) Fill Valve The dishwasher uses a fill valve to fill the machine with water. Verify as the valve is energized that 120 VAC is present between P6-3 and P10-1. If voltage is present and no water enters, check the water supply and shut off valve to make sure water is being supplied to the unit. If water is present, unplug the wires to the fill valve and using an

Drain Motor The dishwasher uses a drain motor to remove water from the tub at timed intervals during the wash cycle. In the drain mode, voltage between P6-4 and neutral should be 120 VAC. If voltage is measured, unplug the wires to the drain motor and using an ohmmeter, check for approximately 30.6  ohms at the valve. If 0  ohms are read, replace the drain

ohmmeter, for approximately 1.1k ohms at the coil. If 0 check  ohms are read, replace the fill valve (see Fill Valve Disassembly procedure, page 45).

pump. If readings are correct, remove pump check for obstructions in the drain pump (seeand Drain Motor Disassembly procedure, page 42).

Drain Motor

Fill Valve

P10-1 P6-4

P6-3

P6-4

P-10

P-10 Main Control Board

Testing the fill valve can be achieved in the diagnostic mode.

Main Control Board

Note:


Note: Testing

the drain motor can be achieved in the diagnostic mode

23

Service Diagnostics and Procedures Control Board Diagnosis (continued) (Some measurements require power and others require the unit not to be powered.) Wash Diverter The dishwasher uses a wash diverter to divert water to either the upper arm or lower arm during the wash cycle. This allows for low water consumption and a better wash to both upper and lower racks. At the beginning of each wash cycle, the control board positions the wash diverter to its proper starting position. is monitored a built monitoring switchItthat sends 120by VAC backinto P6-5 (yellow). Depending on how long the switch is closed determines what position it is in. To check the wash diverter, check the motor with an ohmmeter between P6-2 (gray) and Neutral. It should read approximately 2.7k ohms. If readings are incorrect, verify wiring connections to the diverter. If the wiring is proper, replace the wash diverter(see

Moisture Sensor The dishwasher uses a moisture sensor that is mounted in the base pan of the dishwasher. Any moisture that comes in contact with the sensor will cause the unit to stop filling, operate the drain pump, and signal an error code. If the sensor is open, an open fail code will signal (see Fail Codes, page 16-18). Resistance between P8-1 and P8-2 should be 175K  ohms.

P-8 Moisture Sensor

Wash Diverter Disassembly procedure, page 42).

Main Control Board P6-2

Neutral

Water Temperature Sensor The dishwasher uses a water temperature sensor that is mounted in the sump of the dishwasher. It is an N.T.C (Negative Temperature Coefficient). As the temp of the water rises, the resistance drops (and vice-versa).

Wash Diverter

The control board monitors P8-3 – P8-4. Resistance should be 47K         check wiring. If wiring is OK, replacement of the sensor is necessary.

To Motor To Switch P-8 P-6

Water Temperature Sensor Main Control Board

If the diverter does not position itself, a diverter time out error will display (see Fail Codes, page 16-18). © 2011 Viking Preferred Service Note:

Main Control Board

24

Service Diagnostics and Procedures Control Board Diagnosis (continued) (Some measurements require power and others require the unit not to be powered.) Washer Pressure Sensor The sensor is mounted to the sump retainer ring. As the water level increases, the pressure in the 1 pressure tube, connected to the level sensor input, increases as well. This pressure causes an internal amplifier to vary the output voltage to the board. Forexample, an empty sump should produce a reading of .5 -.8 Volts DC between P8-6 (yellow)

Water Heater The unit uses a 120-volt, 1200 watt heater to heat the water during the wash cycle. To check the heater, unplug the gray wire on P12 and using an ohmmeter, check for 12  ohms between the gray wire and Neutral. If 0  ohms are read, check the wiring to the heater. If the wiring is correct, replace the heater. The heater can also be tested in the

and P8-5 (ground) a fullDepending sump should approximately 3.5 while volts DC. on read the water level, the output voltage to the Control Board changes and is processed in the board.

Diagnostic mode (see pages 14-15).

P-8 Water Heater Water Pressure Sensor

Main Control Board User Interface Port The user interface allows the end consumer to make cycle selections. As the selection is made, the signal is sent to the control board via a ribbon connection. Voltage between P9-1 and P9-2 should be 12 VDC. If no voltage is found, check ribbon connector. If connector is OK, replacement of the user interface is necessary (see Control Panel Removal procedure, page 30).

P-12

P-9 P-10

User Interface Board Main Control Board Main Control Board © 2011 Viking Preferred Service

25

Service Diagnostics and Procedures Control Board Diagnosis (Some measurements require power and others require the unit not to be powered.) Dryer Motor–450 only When the dry cycle begins, 12 volts are sent to the dryer motor. The motor forces ambient air into the dishwasher chamber. This fresh air mixes with and helps to evacuate the hot moisture latent air out of the tank and out through the door vent.

Dryer Motor

P-6 Main Control Board

Dryer Heater–450 only When additional heat is required to help dry the dishes, the control board sends 120 volts to the dry heater. This heat is carried into the dishwasher tank by the dryer motor.

Dryer Heater

P-6

Main Control Board


26

Service Diagnostics and Procedures Parts Location–Door 325 Model

Control Panel  


PO T S PANS

NO RM AL W ASH

SE C O ND W ASH

LIG HT C HINA

RINSE HO LD

Door Latch Interlock

HI T E M P W ASH

Outer Door

1 5 5 ˚ FINAL RINSE

DE LAY ST ART

Door Spring Assembly

Detergent Dispenser

Inner Door Panel

Hinge

InsideView © 2011 Viking Preferred Service

SideView 27

Service Diagnostics and Procedures Parts Location–Door 450 Model

Control Panel   


PO T S PANS

NO RM AL W ASH

SE C O ND W ASH

LIG HT C HINA

RINSE HO LD

Door Latch Interlock

TOP W ASH

Outer Door

E C O NO DRY

1 5 5 ˚ FINAL RINSE

DE LAY ST ART

Center Door Spring Door Panel Assembly

Door Vent

Detergent Dispenser

Inner Door Panel

Hinge

Inner Door Duct Reflector

InsideView © 2011 Viking Preferred Service

SideView 28

Service Diagnostics and Procedures–Disassembly Door Disassembly In order to gain access to the internal components of the door, which includes the detergent dispenser, start switch, door interlock, user interface and the vent door (450 only), you will need to remove the front door panel and the control panel.

The following images show the actual location of the screws.

CAUTION Make sure that the outer door is held in place while removing the screw so that the door does not fall and become dented or scratched. The inner door assembly is sharp and could result in minor personal injury.

Left Side

Outer Door removal (325 and 450) In order to gain access to the inner door components you must first remove the outer stainless steel or wood door panel. Open the door to a complete 90° angle to expose the securing screws. Using a T15 TORX® screwdriver, remove the four screws. These screws are 1” ( 2.5 cm) long.

Screws

Right Side

When the outer door has been removed, make sure to store it in a secure area until reassembled, so it does not become scratched or damaged. Note:

Note:


325 Model shown.

29

Service Diagnostics and Procedures–Disassembly Door Disassembly (cont.) Control Panel Removal After removing the outer door panel, the next step is to remove the control panel assembly. There are six T15 TORX® screws that hold the control panel in place. Using a T15 TORX® screwdriver, remove the screws shown.

Screws

Inner Door Components–325 model With the center door panel and control panel removed, you now have access to the inner door components. The following image shows the inner door with all the panels removed.

Interlock Switch

Detergent Dispenser

The following images show the actual location of the screws.

From here you can test the door interlock switch and the detergent dispenser. Left Side

Right Side

With the outer door panel and the control panel removed, access to the user interface is gained. Note:


30

Service Diagnostics and Procedures Door Disassembly (cont.) Center Door Panel Removal (450 only) Now that the outer panel and control panel have been removed, remove the center door           expose the securing screws. Using a T15 TORX ® screwdriver, remove the four screws shown. These screws are 3/8” (1 cm) long.

Screws

Right Side

Center Door Panel

CAUTION Make sure that the center door panel is held in place while removing the screw so that the door does not fall and become dented or scratched. The inner door assembly is sharp and could result in minor personal injury. The following images show the actual location of the screws.

Remove the two remaining T20 TOX screws (circled), then remove the inner door panel.

Left Side


31

Service Diagnostics and Procedures Door Disassembly (cont.) Inner Door Components–450 Model With the inner door panel removed you now have access to the inner door components. The following image shows the inner door with all the panels removed.

Detergent Dispenser The image below shows a close-up of the detergent dispenser. In order to remove the dispenser, first remove the six T15 TORX® 1/2” (1.7 cm) screws and the two brackets, which hold the dispenser in place (brackets indicated by the red dotted line below).

Active Vent Assembly Interlock Switch WAX motor

Rubber Seal

Detergent Dispenser Inner Door Duct

The image below shows the solenoid unplugged to remove the dispenser assembly. Unplug the two-wire connector plug in order to remove the dispenser.

From here you can test the door interlock switch, the detergent dispenser mechanism, the dryer vent assembly, and WAX motor.

CAUTION Make sure that if the vent tube is removed for any reason, the rubber seal that connects the vent tube to the door assembly is securely fastened. Failure to do so may cause steam to escape during the wash and dry cycles.


32

Service Diagnostics and Procedures Door Disassembly (cont.) Door Latch Interlock The door latch mechanism is secured to the inner door panel by two T20 TORX® 3/4” (1.9 cm) screws. With the control panel removed, remove the two screws.

Inner Door Duct Assembly–450 model The image below shows the lower section of the vent assembly, including the air discharge and moisture return outlet.

Screw

Moisture Return Outlet

Remove the latch mechanism and unplug the 2-wire connector plug from the micro switch shown below.

DryerAirDishcarge

12 VDC

Dryer AirDishcarge

The moisture return outlet of drying vent assembly is held in a retaining bracket which is secured to the inner door liner. In order to remove from the bracket, first grasp onto the vent, carefully bend the bracket (over bending will create a leak), and pull the duct.

If replacing the switch, remove the bracket from the old switch and reinstall on the replacement latch assembly. Remove the TORX® screw shown below.

Screw

DANGER Failure to observe caution could result in electric shock, resulting in permanent injury or DEATH.

The two arrows above show the vent in position. The rectangular red lines shows the area where the condensed moisture returns to the sump area.

CAUTION Make sure that when the vent is reinstalled that the moisture return outlet is snapped back properly intotothe bracket. Failure to do sofloor. may cause water leak onto the consumer’s


33

Diagnostics Door Disassembly (cont.) Door Vent Mechanism–450 model In order to remove the dryer door vent mechanism and WAX motor, unplug the WAX connector harness.

The image below shows the vent spacer removed.

Dryer Vent Door WAX Motor 12 Volts

Connector Harness

The vent door is normally open when the dishwasher is not in use. When switched on, the WAX motor will heat up and close the internal door during a wash cycle and open during the dry cycle. Note:

Open the door and remove the four T15 x 7/8” (2.2 cm) TORX ® screws that hold the stainless steel diverter plate in place.

Now close the door and you can now remove the dryer door vent mechanism as shown below. Be sure that when reassembling the vent that the lip edge of the vent is positioned properly in the opening of the door liner. Failure to do so could cause a water leak inside the door.

Screw

With the diverter plate removed you will see a plastic spacer. The spacer is marked with the word “UP” on each end. When reassembling, make sure the wider edge is facing the top of the door.

Top of door


CAUTION Make sure that when reinstalling the dryer door vent mechanism that the O-ring gasket is in place as shown above. Failure to do so may cause water to leak inside the door and then onto the consumer’s floor.

34

Diagnostics Door Disassembly (cont.) Power ON Light The image below shows the connection of the blue colored power ON light to the toe kick via a 2-wire connector. Whenever the dishwasher is turned on, the LED will shine a bluish. Make sure wires are properly tucked behind panel after reassembly!

Door Spring and Cable Assembly The image below shows the right side door hinge cable, spring, and pulley. The left side is the same.

Spring

Light

Connection

Cable

Hinge Connection Pulley

Connection

CAUTION Make sure that when removing or adjusting the door spring tension thatwear. you are wearing protective gloves and eye Injury can occur should the spring or cable come loose or slip during assembly.

User Interface Board Below is a close-up view of the cable wrapped around the pulley. As the door opens or closes, the cable will ride along the roller creating a smooth movement in the door operation.


35

Service Diagnostics and Procedures Door Disassembly (cont.)

Door Hinge Disassembly

Door Spring and Cable Assembly The image below shows the spring and the channel it rides in. The connection is secured in mounting holes in the channel frame.

To access door hinge, slide unit out of the installation. Next remove the outer door panel (see Outer Door Removal section, page 25). Disconnect tension cable from hinge.

Spring

Tension Cable Hinge

Channel

Hinge Connection The image below shows the spring in its default location (sixth hole from the top).

Remove C-Clip securing hinge. C-Clip Hinge

Note: Remove

C-Clip slowly (clip has spring and

can dislodge).


36

Service Diagnostics and Procedures Door Hinge Disassembly (cont.) Remove two screws that hold each hinge to the inner door. Repair or replace the hinge as necessary.

Screw

Hinge

Reverse the procedure to reinstall the hinge.


37

Service Diagnostics and Procedures Parts Location–Interior

Lower Spray Arm

Coarse Filter Fine Filter


38

Service Diagnostics and Procedures Lower Spray Arm Removal

Fine Strainer Removal

To access lower spray arm, open the door and remove lower rack. Next, unsnap lower spray arm (shown below).

To access fine strainer, open door and remove lower rack. Next, remove coarse strainer (see Coarse Strainer Removal procedure, lower left). Slide fine strainer counterclockwise to disengage.

Spray Arm

Fine Strainer

Repair or replace as necessary. Reverse the procedure to reinstall the spray arm.

Lift fine strainer out and repair or replace as necessary. Reverse the procedure to reinstall the fine strainer.

Coarse Strainer Removal To access coarse strainer, open door and remove lower rack. Next, remove lower spray arm ( see Lower Spray Arm Removal procedure, above). Squeeze tabs on coarse strainer to release (shown below).

Coarse Strainer

Lift coarse strainer out and repair or replace as necessary. Reverse the procedure to reinstall the coarse strainer.


39

Service Diagnostics and Procedures Base Pan–Front View

Base Cover Disassembly

With the dishwasher lying on its back and the toe kick removed, you can look into the base assembly sand check several points before requiring the removal of the unit for service.

Remove the four T20 TORX® screws that hold the bottom base to the dishwasher superstructure. The image below shows the location of these screws. With the panel removed, locate the moisture sensor and unplug, leaving the moisture sensor attached to the base pan.

In the images below, you can see the sump assembly (1),12-Pin disconnect pin (2), and the rear leveling leg adjustment screw (3). In order to access and service the remaining components, the base cover willthe need to motor, be removed to gain access. This includes drain circulation motor, control board, flow-through water heater, wash temp sensor, water valve, front levelers, and the rear leveler (motor controller, dryer heater and dryer motor on the 450 model).

T15 TORX® screw securing moisture sensor to base pan

Screw

(2)

(3)

CAUTION After the four screws that secure the pan to the framesensor are removed, be careful moisture is mounted to the because pan and the the wiring could be damaged.

(1) Water Overflow tube (3)

The image below shows the moisture sensor secured to base pan. The sensor is secured in place by one T15 TORX® screw (shown above).

Unplug connector here

Note: Place

base in a secured area. Take care not to damage thepan sensor.


With the base pan removed, you now have access to locate, diagnose, and service all the components in the base of the dishwasher.

40

Service Diagnostics and Procedures Parts Location–Base Unit–325 Model

Front Leveling Legs

Pressure Sensor

Wash Temp Sensor

Drain Motor Control Board

Water Heater Wash Diverter


Fill Valve

Circulation Motor

Rear Leveling Leg

Bottom View © 2011 Viking Preferred Service

Adjusted from the front (Red dotted line)

41

Service Diagnostics and Procedures Parts Location–Base Unit–450 Model

Front Leveling Legs

Pressure Sensor

Wash Temp Sensor Drain Motor

Water Heater

Control Board

Dryer Motor 12V Dryer Heater


Wash Diverter

Circulation Motor

Fill Valve

Rear Leveling Leg

Bottom View © 2011 Viking Preferred Service

Adjusted from the front (Red dotted line)

42

Service Diagnostics and Procedures Drain Motor Disassembly The image below shows the drain motor. When required, the main control sends 120-volts from terminal P6-4 (brown) wire on the control board and Neutral. Unplug the wires to the motor.

When reinstalling pump, make sure to bend the tab back in place to lock the pump into the sump housing. The image below (left) shows the pump removed. The image below (right) shows sump area with pump removed. Note the location of the O-ring gasket in the sump. Make sure the gasket is in place when reinstalling the pump or the unit will leak water into the base pan.

P10-1 P6-4

Locate the drain hose on the rear of the pump. Using a pair of pliers, disconnect the hose. Images below (left) show the hose connected and (right) shows the hose disconnected.

Wash Diverter Disassembly The wash diverter is designed to direct the water flow to the upper arm, lower arm or both. When required, the main control sends 120-volts AC from terminal P6-2 (gray) wire on the control board and Neutral to activate the motor. The yellow wire on the diverter sends line voltage back to the control board to P6-5 (line in-yellow wire) and tells the controller the position of the diverter.

Next, release the drain motor from the sump assembly. Locate the release tab (indicated by the yellow dotted line, below left). Using a flat blade screwdriver, bend the tab in the direction shown by the arrow (below right) to release the pump from the main housing. Grasp the pump and rotate clockwise and the pump can be removed.

P6-5 P6-2

Neutral

When tab is released, rotate clockwise to remove pump


43

Service Diagnostics and Procedures Wash Diverter Disassembly (cont.)

Circulation Motor Disassembly

Disconnect the yellow hose clamp connection from the diverter inlet as shown.

The 325 and 450 Series Dishwasher utilizes a threephase AC induction motor with variable speed capabilities. The motor is controlled by the motor controller. When required, the main control sends signal voltage to the motor controller to operate the circulation motor. Voltage to all three windings is in the 150 – 160 volt range, measured from each leg to ground. The image below shows the 4-wire connector plug from the controller to the motor.

Yellow Clamp (Diverter Inlet)

Unplug the connector to test or remove the motor.

The wash diverter is attached to the sump by the use of three T20 TORX® screws. Remove all three screws.

Screw

Remove the diverter from the sump assembly. The image below (left) shows the rear of the diverter and below (right) shows the sump area with the diverter removed.

The image below shows the hose connections to the circulation motor inlet, output, and the filter clean sump inlet. Disconnect the green hose clamp from the heater tube to pump inlet as well as the red hose clamp from the filter inlet tube on the pump assembly. Disconnect the pump inlet hose from the pump assembly.

Output

Red Clamp (Filter Inlet) Green Clamp (Pump Inlet)

There are two O-rings that must be put back. Failure to do so will result in a water leak. Note:

CAUTION It is recommended that the diverter be taken out before removing the circulation motor. It makes it easier to handle the motor assembly. © 2011 Viking Preferred Service

44

Service Diagnostics and Procedures Circulation Motor Disassembly (cont.)

Water Heater Disassembly

The image below shows the filter inlet hose to the sump disconnected. The arrow points to the “Filter Clean” inlet in the sump. Regardless of the position of the diverter, water is directed to this tube.

The dishwasher uses a flow-through heater that will heat the water as it passes though the center of the heater. In order to remove, unplug the 2-wire connector that supplies power to the heating element and the ground wire which connects to a

Filter Clean Inlet

Gound Wire

The image below shows the hose disconnected from the pump.

spade on the terminal heater housing. Image to left shows the connections.

To Neutral To Control Board P12

Motor Grommet Bottom Edge

that there is a white motor grommet over the pump opening. Make sure it is back in place and bottom edge is facing base pan before reassembly. (The second right image on page 40 shows proper position of grommet). Note:

Next, disconnect the two clamps that hold the heater assembly to both the sump outlet (Arrow 1) and circulation pump inlet (Arrow 2) shown below. The heater can now be removed for service. You will need to transfer the two 1-1/2” (3.8 cm) OD hoses to the new heater assembly. The element is a 120-volt,12 ohm, 10 amp, 1200 watt draw. It is controlled from P12 Arrow 1 (gray) to Neutral on the main terminal block.

Arrow 2


45

Service Diagnostics and Procedures Water Temperature Sensor Disassembly

Fill Valve Disassembly

The water temperature sensor will sense the temperature of the water throughout the wash cycle. It is an N.T.C (Negative Temperature Control) sensor which reads approximately 47k  ohms at 77° ambient. As the water temperature rises, the resistance drops.

In order to access the fill valve, you will need to lay the unit on its back. Remove the base pan and moisture sensor. The valve is secured to the rear frame with two TORX® screws as shown.

In order to remove, unplug the 2-wire connector and then twist the sensor counterclockwise to release from sump imageGrasp belowthe shows the tempthe sensor in assembly. the lockedThe position. sensor tabs and twist counterclockwise to release. Screw

To Unlock Remove the two screws shown above and remove the fill valve from the base. To Control Board The image below shows the temp sensor in the unlocked position.

Unplug the white and blue wires from the coil, and then disconnect the fill tube from the valve outlet. The fill valve is a 120-volt valve. The coil is a 1.1K  ohm coil and is controlled from P6-6 (line voltage-blue) and P6-7 (Neutral–White) on the main terminal block.

Unlocked

While grasping the tabs, pull the sensor out of the sump assembly as shown.


46

Service Diagnostics and Procedures Control Board Disassembly The control board is secured to the inner left support structure of the dishwasher. Please exercise caution when removing in order to avoid any damage to the board and its components.

Now carefully pull the board down and release from the front.

CAUTION In order to protect the electronic circuits on the board and avoid any damage caused by static discharge, Viking Range Corporation recommends the use of a ground strap. The image below shows the locking tabs that hold the rear board support to the dishwasher frame. Release these tabs in the directions shown by the arrows.

Control board

Disconnect the P7, P4, P8 and the P9 connectors from the board. P8 P9

P7

P4


47

Service Diagnostics and Procedures Control Board Disassembly (cont.)

Motor Controller Board Disassembly

Disconnect the P2, P5, P6, P10, and P12 connectors from the board.

With the control board removed, you can now remove the motor controller for service. The image below shows the motor controller with the P5 and P2 connectors disconnected from the control board. The 4-wire connector to the motor is still connected.

P6

P5

P10

P12

P2

Motor Connector

P2

P5

P5 provides 120-volt AC power to the motor controller. P2 provides the control signal voltage between the control board and the motor controller.

It is recommended that the control be taken out before removing the motor control board. It makes it easier to handle removal. Note:

The motor controller is secured on the left side support frame by four plastic locking plugs. Using a flat blade screwdriver as shown below, carefully extend the bracket away from the dishwasher frame. This will release the locking tabs. Locking Tabs

Screwdriver Blade


48

Service Diagnostics and Procedures Motor Controller Board Disassembly (cont.)

Dryer Motor and Heater Assembly–450 model

The motor controller and circulation motor grounding wires are attached to the dishwasher frame using a ¼” (,63 cm) hex head screw. Remove the screw shown below. After removing the screw, release the lower two locking tabs. You can now remove the motor controller.

In order to remove the dryer motor and heater, you will need to first have the unit lying on its back with the base pan removed. The heater assembly will need to be removed before removing the blower motor. Remove the cover by removing the screw indicated.

WARNING All ground connections MUST be connected when removing and installing components that have ground connections. Failure to do so may cause electrical shock or death along with possible damage to the dishwasher controls. Screw

Locking Tabs

Grounding Screw

With the cover removed, you will notice there is a piece of aluminum tape that must be cut and removed before the heater can be removed (Indicated by the red dotted line below)

There are four screws in total that need to be removed in order to remove the heater. The following images will their locations. © 2011 Viking Preferred Service

49

Service Diagnostics and Procedures Dryer Motor and Heater Assembly–450 model (cont.) With the tape cut and removed, locate the front and rear T20 TORX® screws that hold the heater assembly in place,(shown already removed below).

To access the remaining two screws, the right side air/water Inlet assembly will need to be removed.

With the locking brackets removed, pull the fill chamber away from the right side of the unit.

Remove the two remaining TORX® screws that are indicated below. Now remove the heater assembly.

Open the dishwasher door to locate the air/water Inlet assembly. This assembly is held in place by a front and rear locking bracket. The image below shows the inlet with both brackets attached. Rear Bracket

Screw

Front Bracket

Note: In

Using a flat blade screwdriver, gently pry the locking brackets off the inlet assembly. Both the front and rear brackets are the same. The rear bracket must slide backwards to remove and the front bracket slid forward to remove. The images below shows the rear bracket removed (left) and front bracket removed (right).


the image above, the air/water Inlet assembly is detached from the machine. Disconnect the connector to the heater.

Connector

50

Service Diagnostics and Procedures Heater Assembly–450 model (cont.)

Dryer Motor–450 model

The image below shows the complete heater housing. The two black wires in the photo go to the 120 drying heater. The power is sent from the P6-1 (orange) on the control board.

With the dryer heating element removed you now have access to the dryer blower motor. Remove the 2-wire connector shown below. The blue (P7-3) and red with white tracer (P7-1) supply 12 volts to the dryer motor.

2-Wire Connector

Remove the heater housing to expose the blower motor. Remove the outer T-20 TORX® screw shown below.

Heater Housing Screw

Dryer Blower

When reassembling the heater housing, you must replace the aluminum tape that was removed Note:

during disassembly. Failure do so may cause improper air flow across theto heater.


51

Service Diagnostics and Procedures Dryer Motor–450 model (cont.)

Water Level Sensor

Remove the inner T-20 TORX® screw.

The level sensor is mounted to the sump retainer ring with a T-25 TORX® screw. Removing the level sensor DOES NOT require the removal of the dishwasher from the cabinet. With the toe kick removed, locate the level sensor shown below. Level Sensor

Dryer Blower

Screw

Sump Connection

Screw

The image below shows the three wire connector to the level sensor.

CAUTION When reinstalling the air/water inlet assembly, make sure that both the front and rear brackets are snapped back into their proper positions Failure to do so may cause water to leak through and then onto the consumer’s floor. The O-ring gasket MUST be undamaged (shown below) or water can leak out of the unit and cause damage to the unit and the kitchen area.

O-Ring Gasket

Green WIre Ground In

Brown Wire 5 volts DC in Yellow Wire 0.5-3.5 volts DC out

As the water level increases, the pressure in the 1/4” (.63 cm) pressure tube, connected to the level sensor input, increases as well. This pressure causes an internal amplifier to vary the output voltage to the board. An empty sump should produce a reading of .5 - .8 VDC between J9 – 4 and ground while a full sump should read approximately 3.5 VDC. Depending on the water level, the output voltage to the control board changes and is processed in the board.


52

Service Diagnostics and Procedures Drying System At the beginning of the wash cycle, 12 volts is sent to the door wax motor to close the damper during the wash cycle. When the unit has advanced to the dry cycle, the voltage is removed from the door wax motor and the door opens to allow the drying to take place. The control board then sends 12 VDC to blowermotor to operate. At selected intervals, 120 VAC is also sent to the drying heater coil. As the heated air enters the wash chamber, it is mixed

The image below is a diagram of the water inlet/ dryer inlet tube assembly. During a fill cycle, water enters the chamber (shown in blue) and fills the dishwasher. During a dry cycle, ambient air is blown into the chamber (shown in pink), then into the dishwasher tank from the blower motor.

with the the hot,open moisture ladeninairthe and is vented outof through assembly upper section the door. As the air is moving through the drying vent assembly, the hot air cools and moisture begins to condense into the tube. The water then flows down the chamber and flows back into the sump of the machine. The image below shows the air flow inside the tube.

Water Inlet

Air Inlet


53

Service Diagnostics and Procedures Troubleshooting Guide Below are some general guides should a problem be detected. Please refer to the test procedures in this manual to determine the defective component.

Problem

ProbableCause

The dishwasher does not start

Door is open

Make sure door is closed and check door switch

“Delay Start” option is ON

Turn option OFF

Water supply is disconnected

Verify supply and check water valve

Power cord is disconnected Fuse is blown

Verify power supply and connection Check breaker

Hard water

Check water hardness

Filter block

Check filters for obstructions

No rinse aid

Add rinse aid and check dispenser

Dishwasher detergent

Check amount of detergent and verify it is not old and caked

Wash arms not rotating freely

Obstruction

Remove obstruction

Low water pressure

Check water pressure

Strainer blocked

Obstruction

Removeobstruction

Excessive foam in machine

Improper detergent

Use only dishwasher detergent

Small particles deposited on items

Detergent

Use fresh detergent

Improper loading

Make sure wash arm turns freely

Filter clogged

Verify filters are free of obstructions

Compartment blocked

Verify no obstructions

Old detergent

Use new detergent

Dispenser

Verify dispenser is opening properly

Spotting and filming

Detergent left in detergent compartment Dishesnotdry

Dishwasher will not fill

Rinseaid

Correction

Verify rinse aid in dispenser

Improper loading

Verify proper loading

Water temperature

Verify proper water temperature

Heater

Verify heater is working

Door open

Verify door is closed and check door switch (must press START and shut door within four seconds)

Water valve

Check water valve and check for obstructions

Water supply

Verify water supply and check supply line

Water backs up in sink when dishwasher drains

Food waste disposer

Verify no obstructions in trap at sink

Water left in bottom near filters

Normal

Somewaterinbottomisnormal

Dishwasher will not drain

Drain hose

Verify hose is not obstructed or kinked

Drain pump

Verify no obstructions in pump


54

Wiring and Schematics Wiring Diagram–325 Model


55

Wiring and Schematics Wiring Diagram–450 Model


56

Wiring and Schematics Motor Controller Board Wiring Connections

To Wash Motor

To P2–Control Board

To P5–Control Board

To Wash Motor Plug

Description

Wire Color

To circulation motor

Chassis Ground

Blue


0-160-volts AC to motor

White



Red



Green

P2 to Control Board

Description

Wire Color

From main control P2-4

Serial transmit to main control

Orange


Ground to main control

Purple


Serial receive to motor control

Blue


5-volts DC to motor control

Brown

P5 to Control Board

Description

Wire Color


Neutral from main control

Blue


120-volts from main control

Brown


57

Wiring and Schematics Control Board Wiring Connections P8-1 P8-2 P8-3 P8-4 P8-5 P8-6 P8-7

P9-1 P9-2 P9-3 P9-4 P9-5 P9-6 P4-1 P4-2 P4-3 P4-4

P2-1 P2-2 P2-3 P2-4

RT H RETA W

8P S E N S O R S

P 3

21 P U I P O R T

4K

D O O R P O R T

1

5K M O T O R

P6-1 P6-2 P6-3 P6-4 P6-5

6K 2K

7K

P 5

P5-1 P5-2

2P

4P

1P

P7-1

P 6 A C L O A D S

4P

9P

P R O G

P

P12

ROT O MHSA W

L O D A C D S

P7-2

P10-1

7P

P10-2 01 P

Pin Number

Description

Wire Color

Pin Number

Description

Wire Color

P8-1

Moisturesensor

Purple

P2-1

5 volts DCto motor controller

P8-2

Moisturesensor

Red/White

P2-2

Serial send to motor controller

Blue

P8-3

Temperaturesensor

Black/White

P2-3

Ground from motor controller

Purple

P2-4

Serial receive from motor controller

Orange

P12

Water heater

Gray

P6-1

Dryingheater(450series)

Orange

P8-4

Temperaturesensor

Blue

P8-5

Pressuresensor–ground

Green

P8-6

Pressure Sensor–.5 to 3.5 volts input

Yellow

P8-7

Pressure Sensor–5 volts iutput

P9-1

Userinterface

Red/White

P6-2

P9-2

Userinterface

Black/White

P6-3

P9-3

Userinterface

Purple

P6-4

P9-4

Userinterface

Black/White

P6-5

P9-5

UserInterface

Blue

P9-6

Userinterface

Black/White

P4-1 P4-2

Common to door switch, detergent dispenser and wax motor (450 series) Door switch

Brown Diverter–motor

Gray

Water valve

Blue

Drain motor

Brown

Diverter–switch

P5-1

Neutral to motor controller board

P5-2

120 volts to motor controller board

Yellow Blue Brown

Red/White Yellow

P4-3

VentMotor (450 series)

Brown

P4-4

Dispenser

Orange

P7-1

Drying motor–12 volts (450 series)

Red/White

P7-2

Drying motor–12 volts (450 series)

Blue


Brown

P10-1

Line in

P10-2

Neutral

Black White

58

Wiring and Schematics Component information–Electrical Specifications ComponentName Drain motor

Volts 120-Volts AC

Ohms

Washdiverter

120-VoltsAC

27,000ohms(27kohms)

Circulationmotor

120-155-VoltsAC

15.0ohm-Three-phase

Waterheater

120-VoltsAC

10.5ohm

Watertempsensor

12-VoltsDC

46k-49kohm@Ambiant

Fillvalve

120-VoltsAC

1000ohms(1kohm)

Dryingmotor Moisturesensor

12-VoltsDC 12-VoltsDC

Detergentdispenser Activeventwaxmotor Dryerheatingelement

12-VoltsDC 12-VoltsDC 1120-VoltsAC

Water level sensor 5-Volts DC * When sensor is dry and no corrosion.


Amps

14-15 ohm

1750ohms(17.5kohms) *180,000ohms(180kohms)

0.01

133.3ohm

4

1.2

150

11.4

1400

N/A 0.12 0.7 N/A

N/A N/A

Watts Input/Load 45

1.2 1.2 0.9

N/A 14.4 8.4 N/A N/A N/A 115

Load Load Load Load Input Load Load Input Load Load Load Input

59

Viking VDB325 VDB450 VDB325E VDB450E Dishwasher Service Manual PUB SMK-0003

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